PLT-2713/PLT-6028 Added System Users list to System Console (#5882)

* PLT-2713 Added ability for admins to list users not in any team

* Updated style of unit test

* Split SearchableUserList to give better control over its properties

* Added users without any teams to the user store

* Added ManageUsers page

* Renamed ManageUsers to SystemUsers

* Added ability to search by user id in SystemUsers page

* Added SystemUsersDropdown

* Removed unnecessary injectIntl

* Created TeamUtils

* Reduced scope of system console heading CSS

* Added team filter to TeamAnalytics page

* Updated admin console sidebar

* Removed unnecessary TODO

* Removed unused reference to deleted modal

* Fixed system console sidebar not scrolling on first load

* Fixed TeamAnalytics page not rendering on first load

* Fixed chart.js throwing an error when switching between teams

* Changed TeamAnalytics header to show the team's display name

* Fixed appearance of TeamAnalytics and SystemUsers on small screen widths

* Fixed placement of 'No users found' message

* Fixed teams not appearing in SystemUsers on first load

* Updated user count text for SystemUsers

* Changed search by id fallback to trigger less often

* Fixed SystemUsers list items not updating when searching

* Fixed localization strings for SystemUsers page

webapp/components/user_list.jsx

@@ -8,6 +8,18 @@ import React from 'react';
 import {FormattedMessage} from 'react-intl';
 
 export default class UserList extends React.Component {
+    constructor(props) {
+        super(props);
+
+        this.scrollToTop = this.scrollToTop.bind(this);
+    }
+
+    scrollToTop() {
+        if (this.refs.container) {
+            this.refs.container.scrollTop = 0;
+        }
+    }
+
     render() {
         const users = this.props.users;
 
@@ -31,12 +43,12 @@ export default class UserList extends React.Component {
             content = (
                 <div
                     key='no-users-found'
-                    className='no-channel-message'
+                    className='more-modal__placeholder-row'
                 >
-                    <p className='primary-message'>
+                    <p>
                         <FormattedMessage
                             id='user_list.notFound'
-                            defaultMessage='No users found :('
+                            defaultMessage='No users found'
                         />
                     </p>
                 </div>
@@ -44,7 +56,7 @@ export default class UserList extends React.Component {
         }
 
         return (
-            <div>
+            <div ref='container'>
                 {content}
             </div>
         );